Without seeing the setup of your file and how it's sourced we are left to guess. When I get errors I always start at the beginning with the simplest possible errors and expound from there. Did your source file move? Did your source go through any formatting changes that affect your query (Even the simplest change can affect your query)? Also, open your query and see what errors appear. Good luck! In my experience, it is usually the simplest change that I made and failed to take into account.

Hello,

As Jessica writes, we can only guess as there can be different scenarios behind this message, just search,
One of the scenarios is that there has been a change in the source table headings, but not in the table loaded into the data model.

Br,
Anders